AST1257-940
Page
28
Troubleshooting
The technology upon which the Series 255/940
control is based, is well established and proven in
service over many years. However, should a problem
or question arise regarding the operation of the
system, the control can be very easily serviced. The
control module can be quickly replaced or
adjustments can be made at the installation. For parts
mentioned, refer to exploded views in the
Replacement Parts
section of this manual.
IMPORTANT:
Service procedures that require the
water pressure to be removed from the system are
marked with a
!
after the possible cause. To remove
water pressure from the system, put the bypass valve
or three-valve bypass into the bypass position and
open the Rinse Drain Valve (the fifth valve back from
the control) with a screwdriver, Figure 11. Restore
system water pressure when the service work is
completed.
Problem
Cause
Solution
1. Control will not
regenerate automatically
a. Electric cord unplugged
b. Defective Timer motor
c. Day pins not down on calendar
cap.
d. Binding in gear train of timer
a. Connect power
b. Replace motor
c. Depress pins for days regeneration
required
d. Replace timer
2. Control regenerates at
Wrong time of day
a. timer set incorrectly.
a. Correct setting according to
Instructions.
3. Control will not draw
Brine.
a. Low water pressure.
b. Restricted drain line.
c. Injector plugged.
!
d. Defective injector.
!
e. Valve disc 2 and/or 3 not closed.
f. Air check prematurely closed.
a. Water pressure must be 20 psi
minimum.
b. Remove restriction.
c. Clean injector and screen.
d. Replace injector cap.
e. Flush out foreign matter holding disc(s)
open by manually operating valve
stem(s). Replace if needed.
f. Put control momentarily into brine refill.
replace or repair air check if needed.
Refer to
Brine Line Connection.
4. Brine tank overflow.
a. Brine valve disc1 being held open
By foreign matter.
b. Uncontrolled brine refill flow rate.
c. Valve disc 2 and/or 3 not closed
During brine draw causing brine
refill
d. Air leak in brine line air check.
e. Improper drain control for injector.
a. Flush out foreign matter holding disc
open by manually operating valve stem.
b. Remove and clean brine refill flow
control.
c. Flush out foreign matter holding disc(s)
open by manually operating valve
stem(s).
d. Check all connections in brine line for
leaks. Refer to
Brine Line Connection.
e. Too small of a drain control with a "B"
or "C" injector will reduce draw rates.
Reference
Pressure Graphs.
5. System using more or
less salt than salt control
Is set for.
a. Inaccurate setting.
b. Foreign matter in controller
Causing incorrect flow rates.
c.
Defective controller.
!
a. Make correct setting
b. Remove salt controller and flush out
foreign matter. Manually position
control to brine draw to clean
controller. After so doing, position
control to "brine/slow rinse" to remove
brine from tank.
c. Replace defective part.
Summary of Contents for AST1257-940
Page 20: ...AST1257 940 Page 20 Control Valving Identification Valve Disc Operation...
Page 21: ...AST1257 940 Page 21 Flow Diagrams...
Page 22: ...AST1257 940 Page 22...
Page 24: ...AST1257 940 Page 24...
Page 25: ...AST1257 940 Page 25 Valve Body and Tank Adaptor Module...
Page 29: ...AST1257 940 Page 29...
